I have been using Velvia 100 for about a year (have a friend in Japan....). I really like it. The palette is similar to RVP50 - not quite as saturated, but much better than 100F. The real bonus is the reciprocity charateristics are much improved on RVP50. I also find that it scans a little better (it's not quite as dense). I'll be putting a stash of RVP50 into my freezer, but for the bulk of what I do in color landscapes, RVP100 will be fine (and, I like the extra stop too...).